On a quiet Sunday night in 1987, television viewers across Chicago watched in shock as a stranger hijacked two major broadcast signals.
Decades later, federal investigators still do not know who pulled off one of the most famous signal intrusions in television history.
What We Know
On the night of November 22, 1987, the first interruption occurred during the 9:00 p.m. news broadcast on Chicago station WGN-TV. During a sports recap, the television screen suddenly went dark for several seconds. A figure wearing a rubber mask of the pop-culture character Max Headroom appeared on screen, standing in front of a rotating sheet of corrugated metal. The intruder moved around erratically while a low buzzing noise played over the audio track. Engineers at WGN quickly changed the frequency of their signal transmitter, ending the intrusion after 12 seconds.
Roughly two hours later, at 11:15 p.m., the perpetrator struck a second time during a broadcast of the sci-fi show Doctor Who on public television station WTTW. This time, the hijacker successfully overrode both the video and audio feeds. For about 90 seconds, the masked individual spoke in distorted sentences, mocked local television personalities, and held up various props including a flyswatter. Near the end of the clip, an accomplice stepped in to hit the masked person with the flyswatter before the feed suddenly cut back to the regular program.
The Federal Communications Commission (FCC) and the Federal Bureau of Investigation (FBI) immediately launched an extensive investigation into the incident. Engineers determined that the intruder used a powerful radio transmitter placed on the roof of a building located between the TV station studio and the main broadcast tower. By overpowering the Studio-to-Transmitter Link (STL) microwave signal with a stronger radio signal, the perpetrator bypassed the stations' security systems and broadcast directly to thousands of home television sets.
Despite aggressive efforts by federal authorities and intense local news coverage, no suspect was ever arrested or officially charged. The FCC stated that the perpetrators faced heavy federal fines and up to a year in prison for violating broadcasting laws. However, because the signal was hijacked for only a minute and a half without leaving a physical paper trail, investigators could not trace the origin of the signal. The case eventually went cold, leaving the event recorded as an unsolved mystery in federal records.
The Theories
Theory 1: A Disgruntled Broadcast Insider — One popular explanation suggests that the hijacker was a former employee or contractor with professional knowledge of broadcast equipment. Operating a microwave link transmitter in 1987 required expensive gear, technical training, and an understanding of broadcast frequencies. Investigators suspected that someone who worked for a local TV station or satellite company had the skills and physical access needed to assemble the high-powered radio equipment.
Theory 2: Underground Computer Engineers — Another leading theory points to a small group of local computer hackers or engineering students. During the late 1980s, underground tech clubs and amateur radio hobbyists in Chicago were experimenting with microwave signals and radio gear. Supporters of this theory argue that the prank felt like an elaborate stunt created by young tech enthusiasts who wanted to test their technical skills against major media networks.
Theory 3: An Avant-Garde Art Project — A third explanation is that the intrusion was an underground performance art project. The surreal costume, strange jokes, and bizarre props led some researchers to believe it was designed as a satirical critique of mainstream television culture. Because the intruder made no ransom demands and did not use the airtime for political propaganda, many observers concluded the event was meant purely as an absurd artistic statement.
Decades after the broadcast, key questions remain completely unanswered. Who was the person under the rubber Max Headroom mask, and who held the camera? Where was the hijacking signal actually transmitted from, and what happened to the specialized broadcasting equipment used that night? Unless someone involved breaks their silence with verifiable proof, the true identity and motive behind Chicago's mysterious TV hijacker will remain locked in broadcast history.
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